His train was high atop a slender viaduct across a flat valley, and immediately ahead of him was train D3115, moving so slowly that it might as well have been a wall.

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At this point you will leave the flat Platte River Valley.

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Surrounded by the Pioneer Mountains, Divide was nestled in a flat-backed valley sprinkled with sagebrush and half-burnt two-by-fours, a reminder of when people actually used to live here.

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Down the road from the park visitor center at Furnace Creek is Death Valley Elementary school, a flat-roofed building beside a dry streambed, which blends easily into the gray-brown landscape.

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In the summer, temperatures on the valley floor can reach 120 degrees and a flat tire on an open stretch of road can get you in trouble fast.

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Conversely, in his Thames Valley view, it is the opalescent sky rather than the characteristically flat landscape that dominates the composition.

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Many areas are simply impossible to protect, such as the Brahmaputra valley in Assam, where one of the mightiest rivers in the world keeps changing its course on its flat flood plain.

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